Intermittent-alarm clock.



PATENTED JUNE 26, 1906.

W. E. PORTER.

INTERMITTENT ALARM CLOCK.

APPLICATION FILED JA UNITED sTA rps FATENT OFFICE.

WILSON E. PORTER, OF NEW HAVEN, CONNECTICUT, ASSIGNOR TO NEIV HAVEN CLOCK CO., OF NEW HAVEN, CONNECTICUT, A CORPORATION.

l'NTERMlTTENT-ALARM CLOCK.

Specification of Letters Patent.

Patented June 26, 1906.

Application filed January 8,1906. erial No 295,065.

' To all whom it may concern:

I and exact description of the same, and which said drawings constitute part of this specification, and represent, in

Figure 1, a partial view of my improved in termittent-alarm clock with its rear movement-plate removed; Fig. 2, a broken view, in vertical section, on the line ab of Fig. 1, showing in particular the verge-arbor, the arm depending therefrom, the vibratory spring carried by the said arm, and the alarm-wheel Fig. 3, a perspective view of the carrier-arm and vibratory spring.

My invention relates to an improvement in intermittent-alarm clocks of the type shown and described in my prior patent, No. 580,056, dated April 6, 1897, the object being to produce a simple, reliable, and durable alarm mechanism composed of few parts and assisting rather than handicapping the timetrain during the period when the alarm is being intermittently sounded.

With these ends in view my invention consists in an intermittent-alarm clock having certain details of construction and combinations of parts, as will be hereinafter described, and pointed out in the claims.

In carrying out my invention as herein shown I provide the verge-arbor 2 of the alarm-train with a depending carrier-arm 3, made, as shown, of sheet metal and having its lower end bent forward at a right angle to form a seat 4 for the attachment, by a screw 5 or other means, of the inner end of a thin flexible vibratory stop-spring 6, free at its outer end, arranged in a horizontal plane and having a long slot 7 for the reception of the teeth of a star-like intermittent-alarm wheel 8, interposed between two collars 9 on a special alarm-arbor 10, journaled at its ends in the front and rear movement plates 11 and 12 and carrying a lantern-pinion 13, meshed into by the third wheel 14 of the time-train. The said arbor 10 corresponds,

in effect, to the seconds-hand arbor of a time-train and may be used for a secondshand, if desired. The third wheel 14 of the time-train is driven by the second wheel 15, in turn driven by the main wheel 16, concentric with the mainspring 17. The said verge-arbor 2 carries the verge 18, the hammer 19, and the stop-wire 20, the verge 18 coacting with an escapement-wheel 21, the arbor 22 of which carries a pinion 23 and the stop-wire coacting with an alarm let-off spring 20 operated in the usual manner, as shown in my said prior patent. The said pinion 23 is meshed into by the alarm main Wheel 24, which is driven by an alarm-spring 25, encircling the stem-winding arbor 26. As to the time and alarm trains they may be of ordinary and well-known construction and do not require detailed illustration or description.

When the alarm mechanism has been let off in the usual manner by the release of the stop-wire 20 by the let-off spring 20, the power of the alarm-spring 25 will be transmitted through the alarm-train to the stopspring 6, which will be pulled from left to right, with the effect of assisting inturning the alarm-wheel 8 in the direction in which it is being turned by the mainspring 17 through the medium of the time-train. In other words, from the moment the alarm-train is let off in the usual way the power of the alarm-spring will be thrown open upon the alarm-wheel, 8 so that the alarm-train will assist rather than handicap the action of the time-train. If at the time the alarm-train is let oif the end wall 7 ofthe slot 7 of the spring 6 is engaged with one of the teeth of the alarm-wheel 8, the alarm-train will not be released for the sounding of the alarm until the wheel 8 has revolved sufiiciently to release the spring 6. When that takes place, the alarm-train will be released and the alarm will be sounded by the rapid oscillation of the arbor 2, which as it oscillates will vibrate the spring 6 rapidly back and forth underneath the wheel 8 until the same has brought one of its teeth in position to catch the spring by its end wall 7 The alarm-train will then be restrained until the wheel 8 has been sufficiently rotated to again release the spring 6, which will then vibrate until it is caught by a tooth of the wheel, and so on It is apparent that in carrying out my invention some changes from the construction herein shown and described may be made. I would therefore have it understood that I do not limit myself thereto, but hold myself at liberty to make such departures therefrom as fairly fall within the spirit and scope of my invention.

I claim- 1. In an intermittent alarm clock, the combination with the time and alarm trains thereof, of an alarm-wheel driven by the time-train, and a vibrating spring connected with the alarm-train and engaging with the teeth ofthe said wheel which it tends to revolve in the direction in which the wheel is revolved by the time-train.

2. In an intermittentalarm clock, the

combination with the time and alarm trains thereof, of an arm depending from the vergearbor of the alarm-train, a flexible spring secured to the said arm and formed with a lon- WILSON E. PORTER.

Witnesses:

CLARA L. WEED, GEORGE D. SEYMOUR. 

